Firstly you need to ask your boss, on what basis has he accepted
this for repair? For example has he given a fixed price? or is it
subject to an estimate from you as to time and materials? Because
doing a one off repair to a unusual object can be either easy or a
bottomless pit as to time.
All most any thing can be repaired or remade if money is no object.
So on a technical level, you need to establish approximately how old
it is. this will then give you a clue as to what adhesives were
available to the original maker. Also you would be quite entitled to
scrape some of the adhesive off the stone pieces and or off the
metal? the bracelet is made from.
If it has come apart on account of the owner bending the bracelet to
change its fit, a no no for any bracelet, then the adhesive will
probably be based on plaster of paris, or calcined lime. Heat a
little of the scrapingsto prove this or not.
I assume you have all the pieces to replace where they came from.
Can you see any adhesive between any of the remaining pieces? if you
can you will need to match the colour of the new to the old.
If you cant then a 2 part epoxy is acceptable as it doesnt set
stone/brittle hard and will last the lifetime of the current owner…
Keep us updated as to progress. a picture would help.
If you master this one then it will be another asset to your skills.
Id have no problems taking on such a repair. Wouldnt be cheap tho!!.
Id set aside a whole morning to it and made sure its as good as new.